Introduce new Origin for low-risk dispatchables

[brenzi]

Currently, the Communities pallet only allows one privileged origin. This prevents configuring Testnet Gesell such that everyone can register their test community

new origin TrustableForNonDestructiveAction

• new_community

  pallets/communities/src/lib.rs

  Line 88 in 588953e

  T::CommunityMaster::ensure_origin(origin)?;

• add_locations

  pallets/communities/src/lib.rs

  Line 152 in 588953e

  T::CommunityMaster::ensure_origin(origin)?;

helps with encointer/book#6